Some interesting fanfiction ideas for Black Summer could involve time - traveling elements. Imagine a character going back in time to try and prevent the apocalypse from starting. Or a story about a group of survivors who discover a hidden underground bunker that has a connection to the origin of the virus. Additionally, writing about the evolution of the zombies in the Black Summer universe, like if they start to develop new abilities or behaviors, could make for an exciting fanfiction.
One idea could be exploring the backstories of the minor characters. For example, what was the life of that one survivor in the corner store before the apocalypse? Another could be creating an alternate ending where the characters find a safe haven much earlier. And also, a fanfiction about a character's journey to find their lost family during the Black Summer events.
One idea could be exploring the backstories of the characters more in - depth. For example, what made the antagonist become the way they are. Another could be a 'what if' scenario, like what if the main characters had met under different circumstances. A third idea might be to create an alternate ending to the story presented in Cruel Summer.
The summer dragon could be the key to saving a kingdom that is suffering from an eternal summer. A group of adventurers sets out to find the dragon and convince it to use its power to restore the normal cycle of seasons. Along their journey, they face many challenges like treacherous terrains and other dangerous magical beasts.
One idea could be Summer going on an adventure with Rick to a parallel dimension where all the rules of time are reversed. She could struggle to adapt at first but then use her wits to survive. Another could be Summer getting involved in one of Rick's crazy experiments that accidentally gives her a unique superpower. She then has to figure out how to control it while dealing with the chaos it causes in the family.
One idea could be a time - traveling adventure where Summer and Morty end up in a parallel dimension where their roles are reversed. Morty is the confident, popular one and Summer is the nervous sidekick for a change.
One idea could be a time - travel plot where a fan somehow gets transported into the 5 Seconds of Summer's school days. They could interact with the band members as they were before fame, and maybe even influence their musical journey.
One idea could be a story where Pyrrha and Summer are brought back to life in an alternate reality. They then have to team up to face a new, powerful threat that is endangering their world. Another plot could involve a pre - RWBY story where Pyrrha and Summer meet during a training mission and learn from each other's skills.
One interesting plot idea could be the Digimon characters getting transported to a different digital world during the events of Summer Wars. They could encounter new types of Digimon and have to form alliances to survive. Another idea is that a human character from the Summer Wars universe somehow gains the ability to enter the Digimon world and has to learn how to control their newfound powers. Maybe a group of Digimon come to the human world during Summer Wars and cause chaos, and the main characters have to figure out how to send them back while also dealing with the normal chaos of the Summer Wars event.
Another plot idea is a crossover with a time - travel themed story. The characters from Summer Wars are sent to different time periods, like ancient Rome or the future. They have to adapt to the new cultures and technologies while also trying to find a way back home. Along the way, they might change historical events or gain knowledge that will help them save their own world from a potential threat.
Perhaps Si is transported back in time to when Summer was alive. Si then has the chance to interact with Summer directly. They could become friends and go on adventures together. Along the way, Si could learn valuable lessons from Summer and also change some small events that have a big impact on the future of the RWBY world.
A great plot could be centered around the Summer Maiden's relationships. For example, she might have a forbidden love with a character from the other side, like a member of Salem's faction. This would create a lot of internal conflict as she has to balance her feelings with her duty as a Maiden. Or perhaps she has a deep friendship with a character who is in danger, and she has to use her powers to save them from a great threat.